"The American suits will have a SAFER backpack on. It's called a Simplified Aid for EVA Rescue, and it's a fancy acronym for saying that if for some reason your two tethers have come loose and the worst has happened and you've floated away from where you've been attached to the station, you can activate this SAFER, and it's got some nitrogen jets that you can use to fly yourself back to the station and grab hold and get yourself retethered."